The first task of the philosophy of nature -- The problem of elementarity -- The philosophical myth of creation : the Platonic philosophy of nature -- Aristotle's Physics -- Aristotle's method of cosmological speculation -- Descartes' mechanism -- Isaac Newton and the mathematical principles of natural philosophy -- The world of Leibniz : the best of all possible worlds -- Immanuel Kant : the a priori conditions of the sciences -- The romantic philosophy of nature -- The cosmology of Whitehead: the universe as process -- Popper's open universe -- Science as philosophy -- Problems and methods of the philosophy of nature.